Q4.90P

Balance each of the following redox reactions and classify it as a combination, decomposition, or displacement reaction:

$(a) M g (s) + H_{2} O (g) \to M g {(O H)}_{2} (s) + H_{2} (g)$

$(b) C r {(N O_{3})}_{3} (a q) + A l (s) \to A l {(N O_{3})}_{3} (a q) + C r (s)$

(c) P F_{3} (g) + F_{2} (g) \to P F_{5} (g)

Verified

Answer

The classification of the given reactions are:

(a) Displacement reaction

(b) Displacement reaction

1Step 1: Write balanced reaction of equation (a)

The given reaction is:

$M g (s) + H_{2} O (g) \to M g {(O H)}_{2} (s) + H_{2} (g)$

The balanced reaction is:

$M g (s) + 2 H_{2} O (g) \to M g {(O H)}_{2} (s) + H_{2} (g)$

The given redox reaction is a displacement reaction.

The Mg atom replaces two Hatoms from and forms $M g {(O H)}_{2} .$

2Step 2: Write balanced reaction of equation (b)

The given reaction is:

$C r {(N O_{3})}_{3} (a q) + A l (s) \to A l {(N O_{3})}_{3} (a q) + C r (s)$

The balanced reaction is:

$C r {(N O_{3})}_{3} (a q) + A l (s) \to A l {(N O_{3})}_{3} (a q) + C r (s)$

The given redox reaction is a displacement reaction.

The aluminum atom replaces chromium atom from $C r {(N O_{3})}_{3}$ and forms $A l {(N O_{3})}_{3} .$

3Step 3: Determine the type of reaction of equation (c)

The given reaction is:

$P F_{3} (g) + F_{2} (g) \to P F_{5} (g)$

The balanced reaction is:

$P F_{3} (g) + F_{2} (g) \to P F_{5} (g)$

The given redox reaction is a combination reaction.

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